Startup Cost Estimator
Estimate total startup costs and initial capital requirements for a new business.
What this calculator does
This startup cost estimator adds up what it takes to open the doors and keep them open. Enter your equipment, legal and licensing, inventory, marketing, and office setup costs, then a monthly overhead figure and how many months of working capital you want, and it returns total capital required, split between one-time costs and working capital.
The working capital component is the part that changes the answer. One-time costs are relatively easy to estimate because you can get quotes. The money required to operate for six months before revenue covers expenses is harder to face, and it is almost always the larger of the two numbers.
When to use it
The obvious moment is before launch, when you need to know how much capital to raise, borrow, or set aside. A number produced this way is defensible to a lender or investor in a way that a round figure is not.
It is also useful for deciding when to start rather than whether to. Running the estimate with three months of working capital against twelve shows exactly what patience buys, and often the honest conclusion is to keep the day job for another two quarters. Existing businesses can use the same structure to cost a new location or product line, where the setup and ramp-up problem is identical in miniature.
Understanding the inputs
Equipment cost should be delivered and installed, including anything needed to make it usable. Legal and licensing covers state incorporation, registered agent fees, permits, and attorney time for founding documents and contracts.
Inventory is your opening stock, which for a retailer is usually understated by anyone who has not run a store before. Marketing should cover pre-launch and the first few months, not just a website. Monthly overhead is every recurring cost — rent, payroll, insurance, software, utilities. Working capital months is the runway you are buying: three is thin, six is a reasonable minimum, twelve is prudent for anything with a long sales cycle.
How is this calculated?
Total Startup Cost = Equipment + Legal + Inventory + Marketing + Office + (Monthly Overhead × Working Capital Months).
A worked example
A small services business budgets $22,000 for equipment, $3,500 for legal and licensing, $18,000 for opening inventory, $9,000 for marketing, and $12,000 for office setup — $64,500 in one-time costs. Monthly overhead runs $14,000, and six months of working capital adds $84,000, bringing total capital required to $148,500.
Cutting working capital to three months lowers the requirement to $106,500, which looks far more achievable. It also means the business must reach breakeven within ninety days of opening. Adding a 20 percent contingency to the six-month version gives roughly $178,000, which is closer to what this business will actually need.
Limitations and assumptions
The estimator captures categories you enter and nothing else, so the quality of the output depends entirely on the completeness of your list. Insurance, payment processing, accounting fees, and the founders' own living costs are the items most often left out, and together they are not small.
It assumes zero revenue during the working capital period, which is conservative for some businesses and realistic for many. It also excludes taxes, loan interest, and the possibility that launch slips by a quarter. Treat the output as a floor, add a contingency, and have an accountant review the assumptions before you use the figure in a loan application.
Common Questions
- How much working capital should a startup have?
- Three to six months of operating expenses is the common guideline for a business expecting revenue quickly. Anything with a long sales cycle or a product still in development typically needs twelve to eighteen months of runway. Underfunding the working capital line is the most frequent reason otherwise sound businesses fail early.
- What do founders most often forget to budget for?
- Working capital itself, then insurance, professional fees, payment processing, software subscriptions, and their own living costs. One-time setup expenses are visible and easy to list. The recurring costs of simply existing for six months before revenue arrives are the ones that quietly break the budget.
- How much should I add as a contingency?
- Fifteen to twenty-five percent on top of your total, and more if the business involves construction, custom equipment, or regulatory approval. This is not pessimism — it is an acknowledgment that permits take longer, contractors overrun, and the thing you did not think of always costs money.
- What are the legal and licensing costs for a new business?
- State incorporation fees range from under $100 to several hundred, plus registered agent fees, an EIN which is free, and any state or local licensing your industry requires. Attorney costs for a founders' agreement and standard contracts typically run $2,000 to $5,000 and are usually money well spent.
- Should I choose an LLC, S-corp, or C-corp?
- An LLC is cheapest and simplest for most small businesses. An S-corp election can reduce self-employment tax once profits are meaningful. A C-corp is effectively required if you plan to raise venture capital. The formation cost difference is small, so choose for the tax and fundraising position, not the filing fee.
- Do I need to include my own salary?
- Include your living costs somewhere, whether as salary in the business or as personal runway you have set aside. Budgets that assume the founder needs nothing for a year are the ones that force a bad decision in month eight, when personal pressure rather than business logic starts driving the choices.
- How accurate are startup cost estimates in practice?
- Consistently optimistic. Actual costs commonly land 20 to 50 percent above the initial estimate, driven by timeline slippage more than by any single expense. Every extra month before revenue adds a full month of overhead, which is why launch delays hurt the budget far more than founders expect.
- Should I lease or buy equipment at startup?
- At launch, leasing usually wins on cash grounds even when it loses on total cost, because preserving working capital matters more than optimizing the purchase. Once revenue is predictable, revisit it. Spending scarce startup cash on an asset you could have leased is a common and avoidable error.
- Is it better to raise more than I think I need?
- If the cost of the extra capital is dilution rather than debt, generally yes. Running out of money mid-execution destroys far more value than a few extra points of dilution. That said, more capital raises the valuation you must justify next time, so raise for a milestone rather than for comfort.